In the seventies, the Linhof catalog featured a shutter magnetic release. It was used to reduce risks of camera shake when depressing the classic cable shutter release.
The complete release unit i.e. the release button, switching elements and two 15 volts batteries were inserted into the Linhof anatomical grip.
A magnet had to be screwed on each lens panel, and it was then connected to the grip by means of an electric cable.
By releasing the button, the shutter was tripped with less or no vibrations.
Like many old accessories, this has disappeared from Linhof catalog, maybe because of 15 volts batteries availability ?
On e-B** I have never seen auctions for this accessory.
Who knows more about it ? Where could it be possible to find a used one and several magnets ?